Grinding machinery.



H. C'. WILLIAMSN. GBINDING MACHINERY.

APPLICATION FILED un. a, 1909.

2 SHEET S-BHEBT 2.

1,046.52?.A y Y mman... 10, 1912.

W 1L nees Inventar Rl? 77M., Her/26755- Zz'amson HERBERT C. WILLIAMSON, F WORCESTER, MASSACHUSETTS.'

GRIN DIN G MACHINERY.

Specification of Letters Patent.

Patented Dec. 10, 1912.

Application filed April 3,v 1909. Serial No. 487,755'.

To all whom it may concern:

Be it known that l, HERBERT C. VILLIAM.- sox, a citizen of the United States, residing at forcest-er, in the county ofVorcester,

State Aof Massachusetts, have invented a certain new and useful Improvement in GrindingMachlnery, of which the following 1s a specification, reference being had thereln to the accompanying drawings.

This invention relates to .grinding machilies, but more particularly to such as are used to sharpen inserted tooth cutters of the I:tace mill type. and inserted tooth reamers.

Heretofore, it has been necessary to remove the cutter from the machine in order 'to grind rthe teeth. Not only does this necessitate a considerable expenditureof time and labor, but it is extremely ditlicult to replace the cutter sothat the teeth cut evenly.v

In the present invention, a portable mai chine has been devised which may be 'placed upon the bedof any milling machine, and adjusted to grind the teethjvithout removing the cutter.

An important feature of this device isv that it is not mounted upon or set relative to a fixed pivot Vor center, as has been the case in machines of this class heretofore known. The center of the are in which the grinding element swings, may be placed in any desired position-relative to the work. This allows the grinding'of a considerable number of forms-which couldlnot have been produced upon fixed center machines.

Further features of this machine are that it may be set to grind the teeth on either a horizontal or'vertical spindle cutter, that it may be ad'usted to grind any style of tooth usedv in a gace mill, thatthe bed plate of the grinder may be swung to any desired angle relative to theface of the cutter, that adjust- -able means are provided for limiting the adsweep of the wheel, and numerous others which will be hereinafter` shown and described.

One embodiment of the invention is shown in the drawings in which Figure 1, is a plan view of the invention complete. Fig. 2, a transverse center section of the bed plate and angle iron show-l ing the method'of connecting these, as will be described hereinafter. Fig. 3, a side elevation. Fig. 4, a view of the pivot block detached, as will be described hereinafter. Figs. 5, 6 and 7 some types of cut-ter teeth which may be ground by the device, as will be described hereinafter.

In the drawings, the device comprises an angle iron 8 upon which rests a bed plate 9, fastened tothe angle iron by means of the pivot pin 10 which is att-ached to a block'll seated in the slot.l2 of the angle iron 8. In this bed plate 9 is a circular slot v13 in which operates the block 14, upon which is carried the plate 15 which supports the motor 16. These slots are preferably beveled or inverted T shaped to retain the. blocks.

The motor 16 is preferably constructed with a flange 17 operating in a beveled slot 18 in the plate 15. Upon the shaft 19 of themotor 16 is secured the grinding wheel 20. To the rear edge of the block 15 is at-.

tached an adjusting mechanism 2l foradvancing or withdrawing the grinding wheel from the work. This mechanism .is here shown provided with a hand wheel 22 which is rigidly fastened' to the adjusting screw 23 which passes through a tapped hole in the block 24, carried by the flange 17 of the motor 16. i

Upon one side of the motor is placed an adjustable stop to regulate the advance of the grinding wheel, consisting of a lug 25 upon `the motor 16 through which passes an adjusting screw 26, provided at its rearward extremity with a knurled nut 27, and acting against the post 28 upon the plate 15. A' lock nut 29 is placed upon this screw 26.

In the plate 9 is a beveled circular slot 30 preferably constructed with the-same center as the slot 13. lIn this slot 30 are seated the adjustable stops 31 and These stops are of the usual type with a blockseated inA the slot to which is fastened' the plate 33 by means of the bolt 34, and which may be set at any point of the slot to regulate the'travel of ,the'grinden To the block 1 1 is attached one extremity of the adjusting screw 35 by means of the pin 36. This block is providedy with beveled edges 37 to hold it in the slot 12. At one extremityof this slot 12 is fastened to the angle iron 8 the adjustin device 38 of the usual type in which the w eel is secured to the plate 39 by having its hub pass through this platevand a. collar 40 placed thereon. The adjusting screw passes through a tapped hole in the center of this hub,'so that the tur-ning of the hand wheel advances or withdraws the adjusting screw 35. As this block is attached to the bed plate 9 by means of the pivot pin 10, it may readily be seen that operation of this adjusting means will cause the plate 9 to slide `longitudinally on t e angle iron.

As the plate 9 is pivotally connected to vthe angle iron 8, this plate is free to revolve thereon; To lock this plate to the angle iron, threaded holes '41 'are cut in the iron to contain bolts 42 and 43 provided with washers 44, these bolts'being set in recesses 45 and '46 in the plate 9. The angle iron 8 is provided with recesses 47 and 48 toV contain bolts to fasten this plate to the work table of a milling machine, or other vbase upon-which the grinder may be placed. Similar recesses 49 and 50 are located upon the edge of the plate 51 of the angle iron 8. When it is desired to grind horizox tally, the angle iron 8 is laid fiat upon theltable and fastened by means o'f bolts set in the recesses 47 and 48, but, for vertical grinding,

the device is turned so that it rests upon the plate 51 of the angle iron, and is fastened to this angle.

the table by means of bolts acting .in the recesses. 49 and 50.

To illustrate the grinding of an inserted tooth cutter, a center section of such an article is shown in Fig. 1, and designated 52. Only sect-lon are shown in the figure, and these each have a different form of face to illus# vtrate some of the great variety which may be produced by this grinder.

To obtain clearance on the face of the teeth, thev slot 18 in which the motor slides, and the top face of the plate 15 slope downward toward therear at an angle preferably of from seven to ten degrees with the bed plate,so'tha't the motor is maintained at Numerous other1 forms of construction might-be adopted to thus maintain the motor, as may readily be seen.

This device is here shown provided with a motor, though it should be clearly under.-

` stood that any other suitable means of the two teeth 53 and 54 located at the transmission of power to the grinding wheel 4might be adopted. The current is introduced in this motor at the point 55, and the device is adapted to be connected to an ordinary electric light socket by means of a flexible cord.

The guide slot 13 and the slot 3Q are concentric with the center of curvature preferably at a point slightly in front of the forward-ed e of the bed plate. This center 1s preferabl the limit of advance of the grinding whee. At this point, the face of the wheel merely turns .about its axis as theA block 15vis swung on the bed plate 9. As the wheel is withdrawn, the face .describes a curve of increasing radius.-` l

Ifthe device is to be used for horizontal grinding only, the angle iron 8 may b e removed by swinging the block 14 until 1t uncovers the pivot pin 10, and -unscrewing this pin. The recesses 56 and 57 may be then used to fasten the bed plate to the table on which it is set.

To `dispense with unnecessary weight, the bed plate has been cut away to form a flange 58. The recesses 46, 46, 56 and 57 are cut in this flange. If the angle iron is removed, these recesses 45 and 46 may be used for the same purpose as recesses 56 and 57 To sharpen a horizontal spindle cutter of a milling machine, place the device upon the table of the machine, taking care to locate the grinding wheelgas nearly as possible to its proper position in front of the cutter, and fasten the base` plate 59 of the angle iron 8 to the table by means of bolts set in the recesses 47 and 48. If the grinding wheel is to one side of the face of the tooth,

it may be adjusted by means of the screw 35, or by moving the table. Grasp the handle 60 and swing the block 15 to the left, the guide block 14 acting in the curved slot 13, until the proper initial position of the grinding wheel is reached. Move the adjustable stop 32 until it comes in contact with the block 15 and lock it there. Having started the revolut-ion of the grinding wheel, advance it toward the face of the tooth by means of the adjusting device 21. The block- 15 is then swung to the right by means of the handle 60 until the tooth has been completely ground. The adjusting screw 26 should be advanced until it strikes the post 28 and locked there by the nut 29, while the grinding of the first tooth of the cutter is progressing, so that the wheel may be with drawn 'at the end of this operation, and then instantly returned to the saine position to grind the second and succeeding teeth. To grind the tooth 53, the wheel would be advanced .in the position shown by solid lines to grind the face 61, and then swung into the dotted position to grind the face 62.

lVhen the Wheel is in the latter positioin'the the same as with a horizontal spindle cutter.

If it is desired to Lsharpen a tooth such as is shown in Fig.. 7 it would be necessary to swing the plate 15 so far around to grind the face 63 that a large portion of this plate would be olf the bed plate, Were the latter to remain in the position shown in l. To prevent this, the; bolts 42 and 43, should be removed, the bed plateV swung on its pivot 10 a sufficient distance and the bolts set in the'nearest hole 41. The guide slot 13 Would then extend beyond the front edge of the plate 59 and the plate 15 Would be Well supported in its' extreme position.

A guide finger of the usual adjustable type found in grinding machines could be used with this machine in order to hold each tooth of the -cutter in its proper position in front of thegjvheel during the grinding. In the type of Wh eel shown in the drawings, the' rinding would preferably be. done on the oWer portion 64 of the face of the Wheel.

It may readily be seen that the type of angle iron herein shown and described, might be varied to vallow the grinder to operate other than vertically and horizontally.

" f Itv should be clearly understood that the invention is not .limited to the particular construction and arrangement of parts herein shown and described, as numerous modifications might be made without departing from the scope of the invention.

What I claim as my invention and desire to secure by Letters Patent is 1. In a device of the class described, the combination with abcd plate having a slot in the arc of a ciicle, a Wheel support movable in said slot, a grinding Wheel journaled in said support, with the center of said larc on the face side of said grinding Wheel.

2. In a device of the class described, the combination With a. support, of a grinding Wheel rotatably mounted on'said support, means on said support arranged to move in the arc of a circle and to support said grinding wheel upon the interior of said arc, with the axis of said circle arranged to be on the .face side of said grinding Wheel.

3. In a device of the class described, the

, cmnbination with a support, of a grinding wheel rotatablymounted on said support,

,and means on said support for swinging the face of said grinding Wheel upon the circumference of concentric arcs of'different dii. 1

4. 'In a device of the-class described, .the combination With a support, of a grinding Wheel rotatably mounted on said support,

means on said support arranged to move in the arc of a circle and to support said grinding yWheel upon the interior of said arc, withl the axis of'said circle arranged to be on the face side. of said grindingwheel, andA means for moving said grindingwheel longitudinallyv on the radius of said arc. p

5. In adevice of the class described, .a bed, a grinding Wheel mounted upon a block sliding in a slot in anarc of a circle in said bed, the center of the circlebeing the center of the arc Which is to be ground, adjustable means for limiting the travel of the block in this slot., andV means for rotating the grinding Wheel.

6. In a device ofthe class described, a bed, a grinding Wheel, a block slidingin a slot in an arc of a circle in said bed, the center of the circle being the center. ofthe arc Which is to be ground, av slot running radially in said block, a carriage sliding in said slot upon which is mounted said grind-,

ing Wheel, means` for moving said carriage rotating said Wheel. I

7. In a device of the -class described, a bed plate, a grinding Wheel, a block sliding in a slot in an arc of a circle in said bed plate, the center of the circle being the center of the arc Which is to be ground, a slot running radially in said block, a carriage sliding in said slot, upon which is mounted said grinding Wheel, means for moving said carriage toward or from said center, adjustable means for limiting the advance ofsaid4 carriage in said slot, and means forrotating said Wheel. i

8. In a device of the class described, a

support, a grinding Wheel mounted upon a block sliding in a slot in an arc of a circle in said support, the center of this arc being movable relative to the Work, means for adjusting the grinding Wheel radially ofthe circle, and means for rotating said Wheel.

9. In a devicev of the class described, a bed, a grinding Wheel, an electric motor mounted upon a block sliding in a slot in an arc of a circlein said bed, the center of vthe circle beingthe center of the arcwhich is tobe ground, the shaft of said motor being set radially of said circle, and the,

grinding Wheel fastened upon this shaft.

10. In a device ofv the class described, a,

bed plate, a grinding` Wheel, an electric motor mounted upon a block sliding in-.a

slot in an arc of a circle in said bedl plate,

the center of the circle being the center of the arc which is to be ground, the shaftof "said motor being set radially of said circle pivotallyhonnected on` said angle iron andI '10 capable of a reciprocating movement thereon,y said bed plate having a slot in the arc' 'of a circle, awheel support movable in said slot, a grinding wheel jiourniiled in said support, with the center of said arc on the face sfide of said grinding vv vheel andwith saidv Wheel supfort movable longitdin'ally on the radius of said arc.

In testimony whereof I aiix my signature in presence of two witnesses.

HERBERT o. WILLIAMSON.

Witnesses:

'ALMA H. NEILsoN,

HARTLEY W. BARTLETT.

opies of this patent may kbe obtained for iive cents each, by'addressing the Commissioner of Patenti.

` Washington, D. C. 

